There are heaps of examples of this but this is the one I always use since it was the first time Ir ealised that was why I would associate songs as being similar even when they didn't sound anything alike and also since I love bringing up KY Jelly in conversation cause I'm puerile in a v. juvenile way.

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I think if kissing someone could make them pregnant
the last person I kissed would have had their kid by now...